The most dominant aspect of tennis today is not power, but spin. Spin allows for more controlled power, and also opens up areas of the court a flatter ball may not be able to reach. Wilson set a goal to help players increase spin without changing their swings, and the result was Spin Effect Technology.

While it sounds simple, Spin Effect Technology was a serious, involved project, and the end result was an optimal string pattern to produce maximum spin. Through this process, Wilson determined that the string pattern necessary to produce the optimal coefficient of friction in the string bed was 16 main strings and 15 crosses. As a result, the strings have 3.3 times more movement and 69% more “snap back,” or recoiling of the strings before the ball leaves. This adds up to 200rpm to the player’s shot which, according to Wilson, is like lowering the net by two inches and making the court a foot longer. With a larger “effective” court, players will have more margin for error and added control on their shots, in addition to an expanded number of target areas to play to.

Wilson has determined that the best type of strings to use for the best results in Spin Effect racquets are monofilament strings – like Luxilon 4G -- , which have greater “snap back” qualities of their own. The first racquets to take advantage of Spin Effect Technology are the 2013 Steam 99S and 105S.